Effect of herbicide seed treatment on the reaction of groundnut (Arachis hypogaea L.) to Alectra vogelii (Benth).
A field study was conducted in 1999 and 2000 wet season at Samara (11°11′N; 07°38′E) in the northern Guinea Savanna of Nigeria; to assess the efficacy of seed treatment with herbicides for the control of Alectra vogelii in groundnut. In the investigation, three groundnut genotypes (SAMNUT - 11, SAMNUT - 16, SAMNUT - 18) were evaluated using three rates of imazaquin (0.27, 0.54, 0.81 g a.i.l-1 of water); three cinosulfuran rates (0.02, 0.04, 0.08 g a.i.l-1 of water) and two checks (water soaked and un-soaked). The obtained results showed that in spite of hosting high Alectra infestations, imazaquin at 0.27 g a.i.l-1 of water produced a significantly higher pod and kernel yields than all other treatments in 1999. Although cinosulfuran at all rates reduced Alectra numbers, compared to the checks, it decreased crop vigour, pod and kernel yields.